移动通信系统的切换技术

对移动通信系统切换中的切换过程，切换判决．切换控制作了简单的介绍．对常见的切换技术作了分析比较．尤其是对于TD—SCDMA中的接力切换．详细阐述了其切换执行过程。     

WCDMA网络规划中切换问题的研究

主要针对WCDMA网络规划中切换问题进行研究和分析。首先从移动通信系统切换的概念和功能入手．介绍常见的几种切换方式．并对WCDMA系统中的切换进行分类。然后介绍了切换流程以及切换过程所包含的测量控制、切换判决和切换执行等各个步骤。最后对切换带来的切换比例和开销问题进行了仿真分析，并给出了WCDMA规划中合理的切换比例和相关参数的设置。     

数字集群越区切换的研究(上)

本文介绍了数字集群中越区切换的相关知识和实现方法.首先,介绍了越区切换的产生原因.然后,介绍了越区切换的典型实现方法.接着,以TETRA系统为例着重介绍了数字集群中越区切换的实现过程.包括切换前的测量、切换的策略和如何切换处理.最后介绍了越区切换的考核方法.     

WCDMA中几种常见软切换算法评估

软切换是WCDMA系统所具有的技术特点，它不仅提高了通信的可靠性，而且改善了系统的性能。文中简要介绍了WCDMA中软切换的概念和软切换的基本过程，较详细地说明了几种常见的软切换算法，最后分析了这些算法的评估指标及其仿真结果。     

GSM系统越区切换简介(上)

介绍了越区切换的基本概念和基本过程,包括ＧＳＭ 规范中建议的越区切换算法和主要流程,以及定向重试流程和ＧＳＭ ／ＤＣＳ 双频切换两个较新的概念     

WCDMA的硬切换技术

WCDMA的切换可以分为软切换(包括更软切换)、硬切换、前向切换以及系统间切换。一个典型的切换过程包括测量控制、测量报告、切换判决和执行切换。详细介绍了WCDMA的硬切换技术、信令流程,以及在现网中的实现。建议设备厂商尽量支持各种硬切换触发方式,使运营商有更多的选择。希望在正式商用时,硬切换不成为影响网络质量的重要因素。     

大功率中波发射机主备机真空切换技术研究

本文将传统机械式同轴开关与陶瓷高压真空继电器的特点作了对比,提出了大功率100kW中波广播发射机主备机真空切换新技术。文中介绍了元器件原材料选取,结构布局,切换箱、控制盒、整机之间的连线,控制小盒前面板的操作等基本设计要点,对切换与控制电路原理作了技术性能分析。     

TD—SCDMA集群通信系统切换研究

TD—SCDMA数字集群通信系统是集群通信系统的一个发展方向。本论文首先对TD—SCDMA集群通信系统的切换问题进行了简要的分析,然后从切换的测量、判决、执行3个过程着手,结合智能天线技术对目标小区及切换判决准则的确定进行了深入研究,最后对切换性能进行了简单分析。     

cdma2000网络切换研究

本文从对硬切换和CDMA系统所独有的软切换技术的比较出发，对cdma2000移动通信系统的MS所处的三个不同状态(空闲状态、接入状态、业务信道状态)的切换过程作了较为详细的分析和研究。     

激光全息三维位移定量分析方法评述(文摘)

本文对于全息三维位移定量分析研究方面的情况作了简要的介绍和归纳。其中对各种方法就其基本方程和解析计算、实验光路、实验技术特点、适用对象等问题作了扼要的介绍,对于全息三维位移定量分析研究中的几个问题,诸如测量的精度要求、对刚体运动的补偿、大变形的测试和自动化测量的一些设想等大家所关心的问题提出来供今后研究工作     

基于可信计算的动态完整性度量架构

该文提出一种基于可信计算的操作系统动态度量架构(DIMA),帮助管理员动态地检查系统中进程和模块的完整性。相对于以往的各种操作系统度量架构,该架构能按需对系统中活动的进程或模块进行动态实时的完整性度量与监控,基本解决了其他架构难以避免的TOC-TOU问题,特别是针对某些直接对运行中的进程的攻击有很好的效果。另外,DIMA实现了对对象细粒度度量由度量整个文件实体细分为度量代码、参数、堆栈等等。最后给出了基于Linux操作系统的动态度量原型实现,在实现中使用了基于可信平台模块(TPM)作为架构的信任源点,测试结果表明DIMA能够实现预定目标且有良好的性能。     

Control of fiber manufacturing processes

A review of applications of lasers to measurement and control of optical fiber fabrication processes is given. The unique laser properties of high intensity and good coherence permit accurate measurement and control functions to be performed. Both preform and fiber drawing processes are discussed with the major emphasis being in the drawing operation where the applications are more mature.     

Amplitude And Phase Errors Involved in Retrieving Depolarized Radar Cross Section Measurements

The backscatter of electromagnetic waves from natural surfaces has been of theoretical and experimental interest for a number of years. Of particular interest in recent years is the response of radar systems to linearly polarized (both like and cross polarized) interaction processes associated with earth/land targets. Particularly disconcerting is the general lack of agreement near nadir between depolarized radar data and the theoretical models which attempt to describe these processes. In this paper consideration is given to the geometry of the measurement situation and the nonideal nature of realistic antennas in an attempt to quantify possible measurement system error. The results indicate that induced system error can account for several dB of error in the depolarized measurement. These errors are most significant at the nadir measurement configuration.     

非接触式激光检测技术及在PCB行业中的应用

随着工业技术水平的发展,自动生产线大量应用,新技术和顾客对产品的质量提出了更高的要求,所以现代工业越来越需要非接触式的测量,而激光测量就提供了这样的方式。本文阐述了激光测量的原理、特点、好处以及在PCB制造中的一些应用。     

Recursive least squares estimation for run-to-run control with metrology delay and its application to STI etch process

Run-to-run (RtR) control technology has received tremendous interest in semiconductor manufacturing. Exponentially weighted moving average (EWMA), double-EWMA, and internal model control (IMC) filters are recognized methods for online RtR estimation. In this paper, we consider recursive least squares (RLS) as an alternative for online estimation and RtR control. The relationship between EWMA-type and RLS-type estimates is analyzed and verified with simulations. Because measurement delay is almost inevitable in semiconductor manufacturing, we discuss and compare the performance of EWMA, RtR-IMC, and RLS controllers in handling measurement delay and measurement noise for processes with a deterministic drift. An ad hoc solution is proposed to handle measurement delay for processes with time-varying drifts. The results are illustrated through several simulations and a shallow trench isolation (STI) etch process as an industrial example.     

太阳电池制造过程中的测试工艺

太阳能电池是把太阳能转化为电能的装置,一般的太阳能电池是用半导体材料制成的。按照晶体硅太阳电池制造的工艺流程,对太阳电池制造过程中各工序之间的测试项目进行了介绍。同时,介绍了各测试项目的测试设备、测试原理以及测试过程。     

Correlation Properties of Integrated Random Variables

In general one does not measure point processes, but rather measures an integral of the process over a specific interval. In this note we have investigated how the covariance of a specific class of processes is altered by a finite measurement.     

Real time and an in-process measuring system for the grinding process cylindrical workpieces using Kalman filtering

This paper introduces an in-process measurement system that does not pause during the machining processes. The system could result in enhanced productivity and quality control in manufacturing processes that use a surface grinding spindle. For the gauging sensor of the measurement system, we propose an eddy-current sensor because it is a noncontact type, which uses an eddy current induced when a metallic material is placed in a high-frequency electromagnetic field. Also, it is very insensitive to other kinds of interference such as cutting fluids, coolants, contact pressure, and wear at the contact point. For data analysis, the measurement system was modeled as a linearized discrete form, and the states with noises were estimated by an extended Kalman filter. Validation of this system was performed through a simulation and an experiment.     

波长扫描光纤干涉仪动态扫描特性的研究

建立了用于绝对距离测量的波长扫描光纤干涉仪实验系统。采用了可调谐外腔半导体激光器作为波长扫描光源。研究了光源扫描过程中，输出光功率，波长的动态特性。分析了波长扫描随机漂移的来源及其统计分布，得到了其分布参数对输出信号的影响，为系统的优化设计提供了理论依据。